Trimethyl[2-(phosphonooxy)ethyl]ammonium chloride, calcium salt (1:1)

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

May 17, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

capillary method

Key result

Atm. press.:

ca. 1 016.2 hPa

Decomposition:

yes

Decomp. temp.:

ca. 143.9 °C

The preliminary study and measurements were performed under atmospheric pressure of 1016.2 hPa. The study was carried out in order to determine the melting temperature range for the test item (200 -370ºC). At 245 ºC when heated at 3.0 ºC per minute the test item was melted from above, then was swelled at 249.1ºC, and 252.5ºC a yellow liquid was appeared above the test sample.

Three series of measurements were performed in the temperature range 100 -280ºC. Below the temperature of 135.0 ºC, the temperature gradient was 0.5ºC/min. In all cases, the subsance began to descompose approximately 143.7 - 144 ºC (there were appeared the first drops of substance on the upper walls of the capillary showing the beginning of the descomposition).

Table 1. The observed values of the initial decomposition temperature of 2-trimethylazaniumylethyl phosphate chloride, tetrahydrate

 

Sample	Atmospheric pressure, hPa	The initial decomposition temperature, °C
1	1016.2	143.7
2	1016.2	144.0
3	1016.2	143.9
Average values ± standard deviations, °C		143.9± 0.2

Conclusions:

The test item is decomposed under atmospheric pressure of 1016.2 hPa at 143.9 ± 0.2 ºC (average value).

Executive summary:

The determination of the melting point was carried out in accordance with OECD Guideline for Testing of Chemicals No. 102 “Melting point/melting range” in conformity with the EEC method A.1, following GLP. The capillary tube method was used with the BÜCHI Melting Point B-565 apparatus. A preliminary study was performed under atmospheric pressure of 1016.2 hPa in order to determine the melting temperature range for the test item (200 - 370ºC). The measurements were performed in three samples of the test item. The test item is decomposed under atmospheric pressure of 1016.2 hPa at 143.9 ± 0.2ºC (average value).

Description of key information

Key study: OECD 102 and EU method A.1. GLP study. The test item decomposes under atmospheric pressure of 1016.2 hPa at 143.9 ± 0.2 ºC (average value).

Additional information

Key study: The melting point temperature could not be calculated due to the substance decomposition under atmospheric pressure of 1016.2 hPa at 143 ± 0.2ºC (average value).